Channel Nine presenter Tracy Grimshaw is in hospital after suffering a suspected head injury, when thrown from her horse this morning.

The popular host of A Current Affair was flown by the CareFlight rescue helicopter after being hurt when the horse she was on suddenly reared, as she rode near her rural home.

It's believed Tracy was wearing a helmet at the time, the crew which treated her at the scene suggesting that the animal was spooked by the sound of a lawnmower. They also reported that she may have been unconscious for up to 15 minutes.

The CareFlight helicopter rescue team has confirmed in a statement that: 'A 53-year-old woman was flown to Sydney’s Westmead Hospital this morning with a possible head injury after falling from her horse on the city’s northern outskirts.'

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The CareFlight helicopter pictured at the scene of Tracy Grimshaw's horse-riding accident. The popular TV presenter was riding a horse near her rural property at Arcadia on Sydney's north-western outskirts when it reared and tossed her out of the saddle

Nine Network presenter Tracy Grimshaw is in hospital after suffering an apparent head injury when thrown from a horse. The popular ACA host was wearing a helmet at the time

The Nine Network has confirmed with Daily Mail Australia that the avid horse-rider is recovering in hospital but will need to be kept under observation tonight.

'Tracy had a horse-riding accident this morning and was taken to hospital by CareFlight,' the Network confirmed in a statement.

'She is fine, but still under observation.

'The ACA team and everyone at Nine wish her a speedy recovery.'

CareFlight's team reported that its 'rapid response trauma team were called to the semi-rural property in Arcadia, at 10.25am'.